<template>
  <div>数字：{{num}}</div>
  <button @click="add">+1</button>
   <button @click="dec">-1</button>
</template>

<script>
export default {
data() {
    return{
        num:1
    };
},
methods:{
    add(){
        this.num++
    },
    dec(){
        this.num--
    }
  },
};
</script>

<style>

</style>